1220500189 has 2 divisors, whose sum is σ = 1220500190. Its totient is φ = 1220500188.

The previous prime is 1220500121. The next prime is 1220500201. The reversal of 1220500189 is 9810050221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1109556100 + 110944089 = 33310^2 + 10533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220500189 - 2²³ = 1212111581 is a prime.

It is a super-2 number, since 2×1220500189² = 2979241422698071442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220500109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610250094 + 610250095.

It is an arithmetic number, because the mean of its divisors is an integer number (610250095).

Almost surely, 2^1220500189 is an apocalyptic number.

It is an amenable number.

1220500189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220500189 is an equidigital number, since it uses as much as digits as its factorization.

1220500189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1220500189 is about 34935.6578440996. The cubic root of 1220500189 is about 1068.6757393816.

The spelling of 1220500189 in words is "one billion, two hundred twenty million, five hundred thousand, one hundred eighty-nine".